linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Sun, 14 Dec 2014 19:42:20 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Anvin <hpa@...ux.intel.com>
Subject: Re: frequent lockups in 3.18rc4

On Sun, Dec 14, 2014 at 04:38:00PM -0800, Linus Torvalds wrote:
 > On Sun, Dec 14, 2014 at 3:46 PM, Dave Jones <davej@...hat.com> wrote:
 > > On Sat, Dec 13, 2014 at 02:40:51PM -0800, Linus Torvalds wrote:
 > >  > On Sat, Dec 13, 2014 at 2:36 PM, Dave Jones <davej@...hat.com> wrote:
 > >  > >
 > >  > > Ok, I think we can rule out preemption. I just checked on it, and
 > >  > > found it wedged.
 > >  >
 > >  > Ok, one more. Mind checking what happens without CONFIG_DEBUG_PAGEALLOC?
 > >
 > > Crap. Looks like it wedged. It's stuck that way until I get back to it
 > > on Wednesday.
 > 
 > Hey, this is not "crap" at all. Quite the reverse.

It was more a "Crap it's wedged and I can't do anything about it for days".
I didn't look closely at the actual traces this time.

 > DaveJ, do you have the kernel image for this? I'd love to see what the
 > code is around that "save_xstate_sig+0x81" or around those
 > __clear_user+0x17/0x36 points...
 
Not until I get back on Wednesday and reboot it.

	Dave
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